summaryrefslogtreecommitdiff
path: root/drivers/cpuidle
diff options
context:
space:
mode:
authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-11-18 14:11:24 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-11-19 12:35:13 +0300
commitcbda56d5fefcebc01448982a55836c88a825b34c (patch)
tree3aa65cea77748edc52069182b73dedc9f0169340 /drivers/cpuidle
parent85f6a17f24f9f7faa4aaecf98e12acdd312aa4c9 (diff)
downloadlinux-cbda56d5fefcebc01448982a55836c88a825b34c.tar.xz
cpuidle: Introduce cpuidle_driver_state_disabled() for driver quirks
Commit 99e98d3fb100 ("cpuidle: Consolidate disabled state checks") overlooked the fact that the imx6q and tegra20 cpuidle drivers use the "disabled" field in struct cpuidle_state for quirks which trigger after the initialization of cpuidle, so reading the initial value of that field is not sufficient for those drivers. In order to allow them to implement the quirks without using the "disabled" field in struct cpuidle_state, introduce a new helper function and modify them to use it. Fixes: 99e98d3fb100 ("cpuidle: Consolidate disabled state checks") Reported-by: Len Brown <lenb@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/driver.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index fcaf8b2bab96..c76423aaef4d 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -389,3 +389,31 @@ void cpuidle_driver_unref(void)
spin_unlock(&cpuidle_driver_lock);
}
+
+/**
+ * cpuidle_driver_state_disabled - Disable or enable an idle state
+ * @drv: cpuidle driver owning the state
+ * @idx: State index
+ * @disable: Whether or not to disable the state
+ */
+void cpuidle_driver_state_disabled(struct cpuidle_driver *drv, int idx,
+ bool disable)
+{
+ unsigned int cpu;
+
+ mutex_lock(&cpuidle_lock);
+
+ for_each_cpu(cpu, drv->cpumask) {
+ struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu);
+
+ if (!dev)
+ continue;
+
+ if (disable)
+ dev->states_usage[idx].disable |= CPUIDLE_STATE_DISABLED_BY_DRIVER;
+ else
+ dev->states_usage[idx].disable &= ~CPUIDLE_STATE_DISABLED_BY_DRIVER;
+ }
+
+ mutex_unlock(&cpuidle_lock);
+}